Update codequality job template to use locked image
We need to update the codeclimate image used in auto-devops. Since the version is hardcoded into the template, we would have to update the template here, and a few places too for the documentation.
Even if the version is locked in the current version of the template, some dependencies are being pulled during execution, without any locking (so latest
basically). This leads to issues like gitlab-org/gitlab-ee#4789, where the codequality
is suddenly failing for no reason. The only way to fix this is to bump codeclimate version to latest.
Also, if the codeclimate image was to be removed, all codequality
jobs would start to fail immediately, without any way to fix it without a patch release. We should not depend on external resources, so the codeclimate image is now mirrored on our servers: https://gitlab.com/gitlab-org/security-products/codequality/container_registry